Flowering early-late summer. In and along streams and springs, and in moist shady woods; 30-1100 m; Oreg., Wash.

Because of morphologic intergradation with Corydalis caseana subsp. cusickii , G. B. Ownbey (pers. comm.) does not consider Corydalis aqua-gelidae a distinct species; he believes that it probably should be treated as a subspecies of C . caseana .